Document
ADS1278-HT
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SBAS447E – MARCH 2009 – REVISED APRIL 2013
OCTAL SIMULTANEOUS-SAMPLING 24-BIT ANALOG-TO-DIGITAL CONVERTER
Check for Samples: ADS1278-HT
FEATURES
1
APPLICATIONS
•23 Simultaneously Measure Eight Channels
• Down-Hole Drilling
• Up to 128-kSPS Data Rate
• High Temperature Environments
• AC Performance: 62-kHz Bandwidth 111-dB SNR (High-Resolution Mode) –108-dB THD
• DC Accuracy: 0.8-μV/°C Offset Drift 1.3-ppm/°C Gain Drift
• Selectable Operating Modes: High-Speed: 128 kSPS, 106 dB SNR High-Resolution: 52 kSPS, 111 dB SNR Low-Power: 52 kSPS, 31 mW/ch Low-Speed: 10 kSPS, 7 mW/ch
• Linear Phase Digital Filter • SPI™ or Frame-Sync Serial Interface • Low Sampling Aperture Error • Modulator Output Option (digital filter bypass) • Analog Supply: 5 V • Digital Core: 1.8 V • I/O Supply: 1.8 V to 3.3 V • Currently Available in an HTQFP-64
PowerPAD™ package, an 84-Pin HFQ Package and a KGD Chiptray Option
SUPPORTS EXTREME TEMPERATURE APPLICATIONS
• Controlled Baseline • One Assembly/Test Site • One Fabrication Site • Available in Extreme (–55°C/210°C)
Temperature Range (1) • Extended Product Life Cycle • Extended Product-Change Notification
• Vibration/Modal Analysis
• Multi-Channel Data Acquisition
• Acoustics/Dynamic Strain Gauges
• Pressure Sensors
DESCRIPTION
Based on the single-channel ADS1271, the ADS1278 (octal) is a 24-bit, delta-sigma (ΔΣ) analog-to-digital converter (ADC) with data rates up to 128 k samples per second (SPS), allowing simultaneous sampling of eight channels.
Traditionally, industrial delta-sigma ADCs offering good drift performance use digital filters with large passband droop. As a result, they have limited signal bandwidth and are mostly suited for dc measurements. High-resolution ADCs in audio applications offer larger usable bandwidths, but the offset and drift specifications are significantly weaker than respective industrial counterparts. The ADS1278 combines these types of converters, allowing highprecision industrial measurement with excellent dc and ac specifications.
The high-order, chopper-stabilized modulator achieves very low drift with low in-band noise. The onboard decimation filter suppresses modulator and signal out-of-band noise. These ADCs provide a usable signal bandwidth up to 90% of the Nyquist rate with less than 0.005 dB of ripple.
Four operating modes allow for optimization of speed, resolution, and power. All operations are controlled directly by pins; there are no registers to program. The device is fully specified over the extended industrial range (–55°C to 210°C) and is available in an HTQFP-64 PowerPAD package (-55°C to 175°C), an 84-pin HFQ package and a KGD chiptray option.
• Product Traceability
• Texas Instruments High Temperature Products Utilize Highly Optimized Silicon (Die) Solutions With Dsign and Process Enhancements to Maximize Performance Over Extended Temperatures
(1) Custom temperature ranges available
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. SPI is a trademark of Motorola, Inc.
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All other trademarks are the property of their respective owners.
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PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
Copyright © 2009–2013, Texas Instruments Incorporated
ADS1278-HT
SBAS447E – MARCH 2009 – REVISED APRIL 2013 VREFP VREFN AVDD DVDD IOVDD
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Input1 Input2 Input3 Input4 Input5 Input6 Input7 Input8
DS
DS
DS
DS
Eight
Digital
DS
Filters
DS
DS
DS
SPI and FrameSync Interface
Control Logic
DRDY /FSYNC SCLK DOUT[8:1] DIN
TEST[1:0] FORMAT[2:0] CLK SYNC PWDN[8:1] CLKDIV MODE[1:0]
AGND
DGND
ADS1278
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
Table 1. ORDERING INFORMATION(1)
TA –55°C to 175°C
–55°C to 210°C
PACKAGE PAP HFQ HKP
CHIPTRAY (bare die)
ORDERABLE PART NUMBER ADS1278HPAP ADS1278SHFQ ADS1278SHKP ADS1278SKGDA
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI Web site at www.ti.com.
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PIN OUTS
HFQ .